March 6, 2012 Ms. Kimberly Tisa, PCB Coordinator (OSRR07-2

March 6, 2012

Ms. Kimberly Tisa, PCB Coordinator (OSRR07-2)Remediation and Restoration II BranchUnited States Environmental Protection AgencyRegion 15 Post Office Square, Suite 100Boston, Massachusetts 02109-3912

Re: Analytical results for masonry sampling – 200-wing rooms - PCB Risk-Based Cleanup andDisposalThomas Prince School

Princeton, Massachusetts

Dear Ms. Tisa:

In response to condition 10. c. of the PCB Risk Based Cleanup and Disposal ApprovalConditions for the Thomas Prince School in Princeton, MA (dated February 21, 2012),Environmental Compliance Services, Inc. (ECS), on behalf of the Town of Princeton, hereinsubmits information on the sampling and analysis of interior concrete masonry and exteriorbrick surrounding the louvered vents. In addition, during removal of the north bank ofwindows associated with the kitchen (original to building), thin beads of apparent windowcaulking were observed above and below the windows. A thin bead of apparent windowcaulking was also observed on the concrete window sill below the east and west bankcafeteria windows (windows installed circa 1991). Information on this material is alsopresented herein. The laboratory analytical report is attached. As additional results fromsample analyses are pending, updated data tables will be submitted upon receipt of additionallaboratory data.

On February 14, 2012, ECS collected samples of interior/exterior caulking and masonry productsat the 200-wing classrooms to further delineate the extent of PCBs in the CMU blocksurrounding the interior windows and the brick veneer surrounding the exterior louvered vents.The samples were collected in conformance with EPA protocol and analyzed via EPA approvedmethodology1.

1 The samples were collected from interior and exterior locations of the older portion of the building in accordancewith procedures as presented in EPA Region 1 Standard Operating Procedure for Sampling Porous Surfaces forPCBs, May 2011. The samples were extracted via EPA Method 3540C and analyzed for PCBs via EPA Method8082 and the results were reported on a dry weight basis.

Analytical Results for Masonry Sampling, Thomas Prince School, Princeton, MA, March 6, 2012Page 2 of 3

For the interior CMU block, previous sampling (reported in the January 18, 2012 Cleanup andDisposal Plan) indicated that samples collected on the face of the concrete block parallel to thewindow, at a distance of 1-3 inches from the corner of the block, contained PCB’s at rangesbetween 0.75 ppm to 1.62 ppm. Samples were recently collected (February 14, 2012) from theface of the concrete block parallel to the window at distances of 6 inches and 8 inches from thecorner of the block to further define the extent of PCBs. PCBs were not detected in the recentsamples at concentrations > 1ppm. Thus, the extent of PCB in the interior CMU blocksurrounding the windows has been defined. The application distance of the epoxy coating to theinterior CMU block has not changed from that provided in the original plan, i.e. the entire innerface of the concrete block window frame that was in contact with or adjacent to the metalwindow frame and window caulking, the entire center column of the interior concrete blocklocated between the windows and the concrete block walls located to either side of the windowframe and above and below the window as applicable, at a distance of 6 inches from the cornerof the inner concrete block facing the window (excluding that behind the bulletin board).

For the exterior brick veneer around the louvered vents associated with the 200-wing classrooms,no previous sampling was performed. Samples were recently collected at distances of 2 and 8inches from the caulking surrounding two of the vents. The samples were collected on the sidesof the vents adjacent to the windows. In addition, one sample of caulking associated with thevents was collected. At the vent for classroom 205, PCBs were defined to concentrations <1ppm at 2 inches and 8 inches from the caulked vent. However, samples collected at 2 inchesand 8 inches from the caulked vent for classroom 207 did not define PCBs to < 1ppm (1.56-3.90ppm). Thus, additional sampling of this media was performed on February 29, 2012 foradditional delineation purposes. The results for this additional sampling are pending.

During removal of the kitchen window bank on the north side, caulking was observed atlocations above and below the windows. The caulking observed below the windows was blackin color and was found to contain 18.9 ppm PCB Aroclor-1254 and was isolated on its top sideby the base of the window frame and on the bottom side by copper flashing. All caulking wasremoved from the copper flashing and placed with the other PCB bulk product waste for properstorage and disposal. The caulking observed above the windows was white in color and wasfound to contain 6.19 mg/kg PCB Aroclor-1254 and was isolated on the bottom by the windowframe and on the top by a 1 inch thick by 4 inch wide wooden soffit. The wood soffit wassampled and found to contain 60.7 ppm PCB Aroclor-1254. The caulking and wooden soffitstrip were removed and placed with the other PCB bulk product waste for proper storage anddisposal. Above the wooden soffit was wood that is a structural component of the roof. Arepresentative sample of this material was collected on February 29, 2012. Analytical results ofthis material are pending.

Analytical Results for Masonry Sampling, Thomas Prince School, Princeton, MA, March 6, 2012Page 3 of 3

During removal of the cafeteria window banks on the east and west sides, a very thin strip ofwhite caulking was observed below the windows. The caulking observed below the windowswas isolated on its top side by the base of the window frame and on the bottom side by theconcrete window sill. Based on its appearance (uniform in color and texture and applied to thebase of the window), it was apparent that this caulking was applied at the time of the windowinstallation in 1991. All caulking was removed and placed with the other PCB bulk productwaste for proper storage and disposal. Two coats of epoxy sealant were applied to the entiresurfaces of the concrete window sills. Note that prior sampling of the concrete window sill didnot detect PCBs at concentrations > 1 ppm.

Should you have any questions regarding the above, please contact me at 508-756-0151 (O) or774-272-2212 (M).

Sincerely,

Environmental Compliance Services, Inc.

Charles E. Klingler

Worcester Branch Manager

Attach

Cc: John Lebeaux, Town of PrincetonPeter Brennan, WRSD

Report Date:

28-Feb-12 13:05

Final Report

Re-Issued Report

Revised Reportü

SPECTRUM ANALYTICAL, INC.Featuring

HANIBAL TECHNOLOGY

Laboratory Report

Environmental Compliance Services

722 Route 3A - Suite 3

Bow, NH 03304

Attn: Ryan Rouillard

Project:

Project #:

Thomas Prince School - Princeton, MA

03-216630.00 T.5

Laboratory ID Client Sample ID Matrix Date Sampled Date Received

SB43858-01 Room 205-Int.Wall (6'')

21412-PCB-01

CMU Block 14-Feb-12 13:15 14-Feb-12 17:50

SB43858-02 Room 207-Int.Wall (6'')

21412-PCB-02

CMU Block 14-Feb-12 13:45 14-Feb-12 17:50

SB43858-03 Room 203-Int.Wall (8'')

21412-PCB-03

CMU Block 14-Feb-12 14:10 14-Feb-12 17:50

SB43858-04 Room 201-Int.Wall (8'')

21412-PCB-04

CMU Block 14-Feb-12 14:30 14-Feb-12 17:50

SB43858-05 Exterior Vent adj to (2'') Rm 207

21412-PCB-05

Brick 14-Feb-12 14:45 14-Feb-12 17:50

SB43858-06 Exterior Vent adj to Rm 207 (8'')

21412-PCB-06

Brick 14-Feb-12 15:00 14-Feb-12 17:50


21412-PCB-07

Brick 14-Feb-12 15:10 14-Feb-12 17:50


21412-PCB-08

Brick 14-Feb-12 15:20 14-Feb-12 17:50

SB43858-09 Ext Vent Caulk (light gray) Adj to

Rm 207-PCB 09

Caulk 14-Feb-12 15:30 14-Feb-12 17:50

SB43858-10 Ext Roof Kitchen Bottom Window

Frame Blk Caulk-PCB10

Caulk 14-Feb-12 15:40 14-Feb-12 17:50

SB43858-11 Ext Roof Kitchen Top Window

Frame Wht Caulk-PCB11

Caulk 14-Feb-12 15:50 14-Feb-12 17:50

SB43858-12 Ext Roof Kitchen Top (2'') Window

Frame Wood Nailer-PCB12

Wood 14-Feb-12 15:55 14-Feb-12 17:50

Headquarters: 11 Almgren Drive & 830 Silver Street • Agawam, MA 01001 • 1-800-789-9115 • 413-789-9018 • Fax 413-789-4076

www.spectrum-analytical.com Page 1 of 18

I attest that the information contained within the report has been reviewed for accuracy and checked against the quality control

requirements for each method. These results relate only to the sample(s) as received.

All applicable NELAC requirements have been met.

Massachusetts # M-MA138/MA1110

Connecticut # PH-0777

Florida # E87600/E87936

Maine # MA138

New Hampshire # 2538

New Jersey # MA011/MA012

New York # 11393/11840

Pennsylvania # 68-04426/68-02924

Rhode Island # 98

USDA # S-51435

Authorized by:

Nicole Leja

Laboratory Director

Spectrum Analytical holds certification in the State of Massachusetts for the analytes as indicated with an X in the "Cert." column

within this report. Please note that the State of Massachusetts does not offer certification for all analytes.

Please note that this report contains 18 pages of analytical data plus Chain of Custody document(s). When the Laboratory Report is

indicated as revised, this report supersedes any previously dated reports for the laboratory ID(s) referenced above. Where this report

identifies subcontracted analyses, copies of the subcontractor's test report are available upon request. This report may not be

reproduced, except in full, without written approval from Spectrum Analytical, Inc.

Spectrum Analytical, Inc. is a NELAC accredited laboratory organization and meets NELAC testing standards. Use of the NELAC logo however does

not insure that Spectrum is currently accredited for the specific method or analyte indicated. Please refer to our "Quality" web page at

www.spectrum-analytical.com for a full listing of our current certifications and fields of accreditation. States in which Spectrum Analytical, Inc.

holds NELAC certification are New York, New Hampshire, New Jersey and Florida. All analytical work for Volatile Organic and Air analysis are

transferred to and conducted at our 830 Silver Street location (NY-11840, FL-E87936 and NJ-MA012).

This laboratory report is not valid without an authorized signature on the cover page .

* Reportable Detection Limit Page 2 of 1828-Feb-12 13:05

MassDEP Analytical Protocol Certification Form

Laboratory Name: Spectrum Analytical, Inc. Project #: 03-216630.00 T.5

Project Location: Thomas Prince School - Princeton, MA RTN:

This form provides certifications for the following data set: SB43858-01 through SB43858-12

Matrices: Brick

Caulk

CMU Block

Wood

CAM Protocol

8260 VOC

CAM II A

7470/7471 Hg

CAM III B

MassDEP VPH

CAM IV A

8081 Pesticides

CAM V B

7196 Hex Cr

CAM VI B

MassDEP APH

CAM IX A

8270 SVOC

CAM II B

7010 Metals

CAM III C

MassDEP EPH

CAM IV B

8151 Herbicides

CAM V C

8330 Explosives

CAM VIII A

TO-15 VOC

CAM IX B

6010 Metals

CAM III A

6020 Metals

CAM III D

8082 PCB

CAM V A

9014 Total

Cyanide/PAC

CAM VI A

6860 Perchlorate

CAM VIII Bü

Affirmative responses to questions A through F are required for "Presumptive Certainty" status

Were all samples received in a condition consistent with those described on the Chain of Custody, properly

preserved (including temperature) in the field or laboratory, and prepared/analyzed within method holding

times?

Were the analytical method(s) and all associated QC requirements specified in the selected CAM

protocol(s) followed?

Were all required corrective actions and analytical response actions specified in the selected CAM

protocol(s) implemented for all identified performance standard non-conformances?

Does the laboratory report comply with all the reporting requirements specified in CAM VII A, "Quality

Assurance and Quality Control Guidelines for the Acquisition and Reporting of Analytical Data"?

a. VPH, EPH, and APH Methods only: Was each method conducted without significant modification(s)?

b. APH and TO-15 Methods only: Was the complete analyte list reported for each method?

Were all applicable CAM protocol QC and performance standard non-conformances identified and

evaluated in a laboratory narrative (including all "No" responses to questions A through E)?

Responses to questions G, H and I below are required for "Presumptive Certainty" status

Were the reporting limits at or below all CAM reporting limits specified in the selected CAM protocol(s)?

Data User Note: Data that achieve "Presumptive Certainty" status may not necessarily meet the data usability and representativeness

requirements described in 310 CMR 40. 1056 (2)(k) and WSC-07-350.

Were all QC performance standards specified in the CAM protocol(s) achieved?

Were results reported for the complete analyte list specified in the selected CAM protocol(s)?

All negative responses are addressed in a case narrative on the cover page of this report.

I, the undersigned, attest under the pains and penalties of perjury that, based upon my personal inquiry of those responsible for obtaining the

information, the material contained in this analytical report is, to the best of my knowledge and belief, accurate and complete.

Nicole Leja

Laboratory Director

Date: 2/28/2012

A

B

C

D

E

F

G

H

I

Yes No

Yes No

Yes No

Yes No

Yes No

Yes No

Yes No

Yes No

Yes No

ü

ü

ü

ü

ü

ü

ü

ü

Yes No

9012 Total

Cyanide/PAC

CAM VI A



CASE NARRATIVE:

The samples were received 2.4 degrees Celsius, please refer to the Chain of Custody for details specific to temperature upon receipt.

An infrared thermometer with a tolerance of +/- 1.0 degrees Celsius was used immediately upon receipt of the samples.

If a Matrix Spike (MS), Matrix Spike Duplicate (MSD) or Duplicate (DUP) was not requested on the Chain of Custody, method

criteria may have been fulfilled with a source sample not of this Sample Delivery Group.

MADEP has published a list of analytical methods (CAM) which provides a series of recommended protocols for the acquisition,

analysis and reporting of analytical data in support of MCP decisions. "Presumptive Certainty" can be established only for those

methods published by the MADEP in the MCP CAM. The compounds and/or elements reported were specifically requested by the

client on the Chain of Custody and in some cases may not include the full analyte list as defined in the method. Regulatory limits may

not be achieved if specific method and/or technique was not requested on the Chain of Custody.

According to WSC-CAM 5/2009 Rev.1, Table 11 A-1, recovery for some VOC analytes have been deemed potentially difficult.

Although they may still be within the recommended recovery range, a range has been set based on historical control limits.

Some target analytes which are not listed as exceptions in the Summary of CAM Reporting Limits may exceed the recommended RL

based on sample initial volume or weight provided, % moisture content, or responsiveness of a particular analyte to purge and trap

instrumentation.

Sample Acceptance Policy Case Narrative:

Spectrum Analytical Sample Acceptance Policy, in conjunction with NELAC Sample Acceptance Policy (5.5.8.3.2.), require that all

samples submitted must have labels attached to each container identifying the sample ID, site location, and/or project number and the

collection date written in indelible ink. This is necessary in order to ensure identifiable samples and to maintain sample integrity.

Containers in this work order were received without sample labels attached to the sample jars (bottles). Please insure that all sample

containers are properly labeled with a unique sample ID, site location, and/or project number and collection date.

See below for any non-conformances and issues relating to quality control samples and/or sample analysis/matrix.

SW846 8082A

Samples:

SB43858-12 Ext Roof Kitchen Top (2'') Window Frame Wood Nailer-PCB12

The concentration indicated for this analyte is an estimated value. This value is considered an estimate (CLP E-flag).

Aroclor-1254 [2C]

SB43858-12RE1 Ext Roof Kitchen Top (2'') Window Frame Wood Nailer-PCB12

Sample dilution required for high concentration of target analytes to be within the instrument calibration range.

The surrogate recovery for this sample cannot be accurately quantified due to interference from coeluting organic compounds

present in the sample extract.

Decachlorobiphenyl (Sr) [2C]



Room 205-Int.Wall (6'') 21412-PCB-01

Sample IdentificationMatrix

14-Feb-12 13:15

Collection Date/Time Received

14-Feb-12

Client Project #

03-216630.00 T.5 CMU BlockSB43858-01

Result AnalyzedMethod Ref. Cert.BatchPreparedDilutionAnalyte(s) Units *RDLFlagCAS No. AnalystMDL

Semivolatile Organic Compounds by GC

Polychlorinated Biphenyls

Prepared by method SW846 3540C

SW846 8082A 15-Feb-1214-Feb-12mg/kg dry 0.05250.70111097-69-1 Aroclor-1254 1 1203435BLM0.0385

Surrogate recoveries:

30-150 % " " ""4,4-DB-Octafluorobiphenyl

(Sr)

49 "10386-84-2


(Sr) [2C]

55 "10386-84-2

30-150 % " " ""Decachlorobiphenyl (Sr) 50 "2051-24-3

30-150 % " " ""Decachlorobiphenyl (Sr)

[2C]

112 "2051-24-3

General Chemistry Parameters

SM2540 G Mod. 15-Feb-1215-Feb-12%99.6% Solids 1 1203496DT



Room 207-Int.Wall (6'') 21412-PCB-02


14-Feb-12 13:45


14-Feb-12

Client Project #

03-216630.00 T.5 CMU BlockSB43858-02








(Sr)

43 "10386-84-2


(Sr) [2C]

63 "10386-84-2



[2C]

122 "2051-24-3





Room 203-Int.Wall (8'') 21412-PCB-03


14-Feb-12 14:10


14-Feb-12

Client Project #

03-216630.00 T.5 CMU BlockSB43858-03








(Sr)

37 "10386-84-2


(Sr) [2C]

42 "10386-84-2



[2C]

44 "2051-24-3





Room 201-Int.Wall (8'') 21412-PCB-04


14-Feb-12 14:30


14-Feb-12

Client Project #

03-216630.00 T.5 CMU BlockSB43858-04








(Sr)

33 "10386-84-2


(Sr) [2C]

46 "10386-84-2



[2C]

57 "2051-24-3





Exterior Vent adj to (2'') Rm 207 21412-PCB-05


14-Feb-12 14:45


14-Feb-12

Client Project #

03-216630.00 T.5 BrickSB43858-05








(Sr)

82 "10386-84-2


(Sr) [2C]

73 "10386-84-2



[2C]

75 "2051-24-3





Exterior Vent adj to Rm 207 (8'') 21412-PCB-06


14-Feb-12 15:00


14-Feb-12

Client Project #

03-216630.00 T.5 BrickSB43858-06








(Sr)

64 "10386-84-2


(Sr) [2C]

64 "10386-84-2



[2C]

66 "2051-24-3







14-Feb-12 15:10


14-Feb-12

Client Project #

03-216630.00 T.5 BrickSB43858-07








(Sr)

76 "10386-84-2


(Sr) [2C]

73 "10386-84-2



[2C]

80 "2051-24-3







14-Feb-12 15:20


14-Feb-12

Client Project #

03-216630.00 T.5 BrickSB43858-08








(Sr)

67 "10386-84-2


(Sr) [2C]

66 "10386-84-2



[2C]

73 "2051-24-3


SM2540 G Mod. 15-Feb-1215-Feb-12%100% Solids 1 1203496DT



Ext Vent Caulk (light gray) Adj to Rm 207-PCB 09


14-Feb-12 15:30


14-Feb-12

Client Project #

03-216630.00 T.5 CaulkSB43858-09








(Sr)

85 "10386-84-2


(Sr) [2C]

78 "10386-84-2



[2C]

88 "2051-24-3





Ext Roof Kitchen Bottom Window Frame Blk Caulk-PCB10


14-Feb-12 15:40


14-Feb-12

Client Project #

03-216630.00 T.5 CaulkSB43858-10





SW846 8082A 16-Feb-1214-Feb-12mg/kg dry 0.15218.911097-69-1 Aroclor-1254 1 1203435IMR0.112



(Sr)

130 "10386-84-2


(Sr) [2C]

102 "10386-84-2



[2C]

80 "2051-24-3





Ext Roof Kitchen Top Window Frame Wht Caulk-PCB11


14-Feb-12 15:50


14-Feb-12

Client Project #

03-216630.00 T.5 CaulkSB43858-11








(Sr)

47 "10386-84-2


(Sr) [2C]

99 "10386-84-2



[2C]

108 "2051-24-3





Ext Roof Kitchen Top (2'') Window Frame Wood Nailer-PCB12


14-Feb-12 15:55


14-Feb-12

Client Project #

03-216630.00 T.5 WoodSB43858-12





SW846 8082A 16-Feb-1214-Feb-12mg/kg dry 0.205E60.711097-69-1 Aroclor-1254 1 1203435IMR0.0870



(Sr)

101 "10386-84-2


(Sr) [2C]

103 "10386-84-2



[2C]

128 "2051-24-3

Re-analysis of Polychlorinated Biphenyls GS1





(Sr)

130 "10386-84-2


(Sr) [2C]

130 "10386-84-2


30-150 % " " ""S02Decachlorobiphenyl (Sr)

[2C]

155 "2051-24-3





Semivolatile Organic Compounds by GC - Quality Control

Result Units

Spike

Level

Source

Result %REC

%REC

Limits RPD

RPD

LimitFlagAnalyte(s) *RDL

Batch 1203435 - SW846 3540C

Blank (1203435-BLK1) Prepared: 14-Feb-12 Analyzed: 15-Feb-12

mg/kg wet< 0.00999Aroclor-1016 0.00999

mg/kg wet< 0.00998Aroclor-1016 [2C] 0.00998

mg/kg wet< 0.0180Aroclor-1221 0.0180


mg/kg wet< 0.0128Aroclor-1232 0.0128


mg/kg wet< 0.0118Aroclor-1242 0.0118


mg/kg wet< 0.00981Aroclor-1248 0.00981


mg/kg wet< 0.0147Aroclor-1254 0.0147


mg/kg wet< 0.00767Aroclor-1260 0.00767


mg/kg wet< 0.0186Aroclor-1262 0.0186


mg/kg wet< 0.00628Aroclor-1268 0.00628


0.0200 30-150Surrogate: 4,4-DB-Octafluorobiphenyl (Sr) 0.0154 mg/kg wet 77

0.0200 30-150Surrogate: 4,4-DB-Octafluorobiphenyl (Sr)

[2C]

0.0152 mg/kg wet 76

0.0200 30-150Surrogate: Decachlorobiphenyl (Sr) 0.0175 mg/kg wet 88

0.0200 30-150Surrogate: Decachlorobiphenyl (Sr) [2C] 0.0167 mg/kg wet 84

LCS (1203435-BS1) Prepared: 14-Feb-12 Analyzed: 15-Feb-12

0.250 50-140mg/kg wet0.212 85Aroclor-1016 0.00999

0.250 50-140mg/kg wet0.215 86Aroclor-1016 [2C] 0.00998

0.250 50-140mg/kg wet0.204 82Aroclor-1260 0.00767

0.250 50-140mg/kg wet0.206 82Aroclor-1260 [2C] 0.00893



[2C]

0.0147 mg/kg wet 74



LCS Dup (1203435-BSD1) Prepared: 14-Feb-12 Analyzed: 15-Feb-12

0.250 3050-140 5mg/kg wet0.201 80Aroclor-1016 0.00999

0.250 3050-140 3mg/kg wet0.223 89Aroclor-1016 [2C] 0.00998

0.250 3050-140 5mg/kg wet0.195 78Aroclor-1260 0.00767

0.250 3050-140 0.7mg/kg wet0.204 82Aroclor-1260 [2C] 0.00893



[2C]

0.0143 mg/kg wet 72





Notes and Definitions

The concentration indicated for this analyte is an estimated value. This value is considered an estimate (CLP E-flag).E

Sample dilution required for high concentration of target analytes to be within the instrument calibration range.GS1

The surrogate recovery for this sample cannot be accurately quantified due to interference from coeluting organic

compounds present in the sample extract.

S02

RPD Relative Percent Difference

dry Sample results reported on a dry weight basis

Not ReportedNR

Laboratory Control Sample (LCS): A known matrix spiked with compound(s) representative of the target analytes, which is used to

document laboratory performance.

Matrix Duplicate: An intra-laboratory split sample which is used to document the precision of a method in a given sample matrix.

Matrix Spike: An aliquot of a sample spiked with a known concentration of target analyte(s). The spiking occurs prior to sample

preparation and analysis. A matrix spike is used to document the bias of a method in a given sample matrix.

Method Blank: An analyte-free matrix to which all reagents are added in the same volumes or proportions as used in sample

processing. The method blank should be carried through the complete sample preparation and analytical procedure. The method blank

is used to document contamination resulting from the analytical process.

Method Detection Limit (MDL): The minimum concentration of a substance that can be measured and reported with 99% confidence

that the analyte concentration is greater than zero and is determined from analysis of a sample in a given matrix type containing the

analyte.

Reportable Detection Limit (RDL): The lowest concentration that can be reliably achieved within specified limits of precision and

accuracy during routine laboratory operating conditions. For many analytes the RDL analyte concentration is selected as the lowest

non-zero standard in the calibration curve. While the RDL is approximately 5 to 10 times the MDL, the RDL for each sample takes

into account the sample volume/weight, extract/digestate volume, cleanup procedures and, if applicable, dry weight correction. Sample

RDLs are highly matrix-dependent.

Surrogate: An organic compound which is similar to the target analyte(s) in chemical composition and behavior in the analytical

process, but which is not normally found in environmental samples. These compounds are spiked into all blanks, standards, and

samples prior to analysis. Percent recoveries are calculated for each surrogate.

Continuing Calibration Verification: The calibration relationship established during the initial calibration must be verified at periodic

intervals. Concentrations, intervals, and criteria are method specific.

Validated by:

June O'Connor

Nicole Leja



Documents

March 6, 2012 Ms. Kimberly Tisa, PCB Coordinator (OSRR07-2